Pressure controlled electric switch



2 Sheets-Sheet 1 Filed May 20, 1955 i i .5 w

ENTOR.

March 5, 1957 A. c. BURCH 2,784,271

PRESSURE CONTROLLED ELECTRIC SWITCH Filed May 20, 1955 2 Sheets-Sheet 2 United States Patent PRESSURE CONTROLLED ELECTRIC SWITCH Arthur C. Burch, Pinson, Ala.; Susie M. Burch, executrix of said Arthur C. Burch, deceased Application May 20, 1955, Serial No. 509,812

2 Claims. (Cl. 200-83) This invention relates to a pressure controlled electric switch. It has for its main objects to provide such a switch that will be highly satisfactory for the purpose intended, simple in structure, comparatively cheap to manufacture, easy to keep in working condition, and very durable.

In the use of electric operated Water pumps of various types for different purposes it often occurs that the pumps are located at places not subject to frequent inspection, such as well water pumps and the like. Often when the pressure goes down in a pump operated by an electric motor damage results by idle running of the motor and pump. The present invention eliminates such hazards.

Other objects and advantages will appear from the drawings and specification.

By referring generally to the drawings, a part of this application, it will be observed that Fig. 1 is a top plan view of a switch assembly made according to this invention; Fig. 2 is a side elevational view of the switch in closed condition; Fig. 3 is a view on line 33 of Fig. l; and Fig. 4 is a side elevational view of the switch in open condition.

Similar reference numerals refer to similar parts throughout the several views.

Referring to the drawings in detail it will be seen that the switch comprises a flange .1 as a base attached to a flange portion 2 integral with a tube portion 3 connected to a pump (not shown). A flexible gasket 4 with an integral extension 5 is mounted between the flanges and there held by cap bolts 5'. Supports 6, 7 and 8 are integral with the flange 1. An inverted T-shaped member 9 is mounted movably on a pin 10 through support 7 and provided with a hole at 11 for a cap screw 12 to be inserted therethrough and into a threaded hole 13 in the flange. A coil spring 14 is mounted on the cap screw and is set in tension to urge the free end of the member toward the flange. The member 9 is provided with a notch 15 to accommodate the pointed end 16 of member 17 that is mounted rockably on a pin 18 through support 7. Member 17 is provided with a hole at 19 for cap screw 20 to be inserted therethrough. A threaded hole 21 is in the top of the support 6 to accommodate the cap screw 20. A spring 22 is mounted on cap screw 20 and is set in tension to urge the end 23 of the member toward the top of support 6. An electric contact point 24 is mounted on the upper end of member 17 to complete the circuit between the ends 25 and 26 connected to wires 27 and 28 insulated by non-conducting material 29 held by screws 30 and 31 on the end 32 of support 8.

From the foregoing it will appear that when the switch is set as appears in Fig. 2 the diaphragm portion 33 of the gasket 4 with pressure against it will overcome the tension of the springs and hold the par-ts set to complete the circuit to the pump (not shown) motor (not shown), but if the pressure fails on the diaphragm, then the springs will separate the parts as shown in Fig. 4 and thus break the circuit causing the motor (not shown) to stop.

The assembled switch maybe made of any material suitable for the purpose; also it may be made in different sizes and capacities depending on how and where to be used.

While I have shown and described the preferred em- 2,784,271 Patented Mar. 5, 1957 bodiment of my invention, 1 do not wish to limit same to the exact and precise details of structure, but reserve the right to make all modifications and changes so long as they remain within the scope of the invention and the following claims.

Having described my invention 1 claim:

1. A pressure controlled electric switch of the character described comprising a base flange, a second flange having a tube end integral therewith, a flexible gasket mounted between the flanges, a plurality of cap bolts holding said flanges and gasket together, said base flange having a hole through its center portion, said gasket having an extended round portion and being inserted through the hole in the flange, said flange having three supporting portions integral therewith and extending from the flange face, and inverted T-shaped member attached by one end pivotally on one of said supporting portions, a notch in one end of the member, the said member having a hole through its third end, a cap screw mounted through the hole in the member, a threaded hole in the base to accommodate the threaded end of the cap screw, a coil spring mounted around said cap screw, said spring set in tension to urge the end of the T-shaped member toward the base; a second member shaped similar to the letter L and being mounted rockably on a pin through the support having the T-shaped member pivoted thereto, said L-shaped member having a pointed end adapted to fit into the said notch, said L-shaped member having a hole through one of its ends, a cap screw inserted through the hole in the L- shaped member, the support under the hole having a threaded hole in its end to accommodate the cap screw; an end of the L.shaped member having an electric contact point mounted insulated thereon, the third support on the base having a double electric contact point attached in insulated condition to its top end, electric wires connected to said double electric contact points.

2. A pressure controlled electric switch of the character described comprising in combination and adapted to co-act with each other, a base flange, a second flange having a tube end integral therewith, a flexible gasket mounted between the flanges, a plurality of cap bolts holding said flanges and gasket together, said base flange having a hole through its center portion, said gasket having an extended round portion and being inserted through the hole in the flange, said flange having three supporting portions integral therewith and extending from the flange face, an inverted T-shaped member attached by one end pivotally on one of said supporting portions, a notch in one end of the member, the said member having a hole through its third end, a cap screw mounted through the hole in the member, a threaded hole in the base to accommodate the threaded end of the cap screw, a coil spring mounted around said cap screw, said spring set in tension to urge the end of the T-shaped member toward the base; a second member shaped similar to the letter L and being mounted rockably on a pin through the support having the T-shaped member pivoted thereto, said Lshaped member having a pointed end adapted to fit into the said notch, said L-shaped member having a hole through one of its ends, a cap screw inserted through the hole in the L-shaped member, the support under the hole having a threaded hole in its end to accommodate the cap screw; an end of the L-shapcd member having an electric contact point mounted insulated therein, the third support on the base having a double eiectric contact point attached in insulated condition to its top end, electric wires connected to said double electric contact points.

Sweden May 17, 1922 Australia Oct. 8, 1928 

